Update data-binding.md: fixed typo (#2982)

[hyokosdeveloper]

whenever should be written with a capital W because it's at the beginning of a list.

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

⤵️ What is the current behavior?

🆕 What is the new behavior (if this is a feature change)?

💥 Does this PR introduce a breaking change?

🐛 Recommendations for testing

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🤔 Checklist before submitting

• All projects build
• Follows style guide lines (code style guide)
• Relevant documentation was updated (docs style guide)
• Rebased onto current develop

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[martijn00]

@hyokosdeveloper can you sign the CLA so we can merge this?

[nmilcoff]

@hyokosdeveloper any news? We would love to have this merged!